Cisco IOS上Segment Routing TE的简单实验

最近看了些Segment Routing的一些资料,官网找到的实验都是基于IOS-XR系统的,于是自己查看配置手册试着做了个简单实验测试下效果。

拓扑如下:


R1、R2、R3、R5、R6、R7之间运行OSPF和SR。
需要实现R1到R7的路径可以通过SRTE调控。

相关配置:

R1:

version 16.6
service timestamps debug datetime localtime
service timestamps log datetime localtime
!
hostname R1
!
enable secret 5 $1$iHyN$7.g231aGWy4GvTqV5r8yL1
!
aaa new-model
!
clock timezone Beijing 8 0
!
!
no ip domain lookup
!
mpls traffic-eng tunnels
!#开启MPLS流量工程
!
segment-routing mpls
 !
 connected-prefix-sid-map
  address-family ipv4
   1.1.1.1/32 index 1 range 1 
  exit-address-family
 !#开启SR并映射1.1.1.1的SID为16001
!
username cisco privilege 15 secret 5 $1$4pA7$0P6EYBG0CR0gNFIRuNQ.5/
!
!
interface Loopback0
 ip address 1.1.1.1 255.255.255.255
 ip ospf network point-to-point
 ip ospf 1 area 0
!
interface Tunnel17
 ip unnumbered Loopback0
 tunnel mode mpls traffic-eng
 tunnel destination 7.7.7.7
 tunnel mpls traffic-eng autoroute announce
 tunnel mpls traffic-eng path-option 1 explicit name 1-2-3-7 segment-routing
 tunnel mpls traffic-eng path-option 2 explicit name 1-5-6-7 segment-routing
 tunnel mpls traffic-eng path-option 3 explicit name 1-2-3-5-6-7 segment-routing
 tunnel mpls traffic-eng path-option 4 explicit name 1-2-3-5-2-6-7 segment-routing
 tunnel mpls traffic-eng path-selection metric igp
 tunnel mpls traffic-eng load-share 10
!
interface GigabitEthernet1
 ip address 192.168.12.1 255.255.255.0
 ip ospf network point-to-point
 ip ospf 1 area 0
 mpls traffic-eng tunnels
!#接口下需要开启MPLS的流量工程不然tunnel接口无法激活,并提示去往下一跳的接口不可达
interface GigabitEthernet2
 ip address 192.168.15.1 255.255.255.0
 ip ospf network point-to-point
 ip ospf 1 area 0
 mpls traffic-eng tunnels
!
!
router ospf 1
 router-id 1.1.1.1
 segment-routing area 0 mpls
 segment-routing mpls
 mpls traffic-eng router-id Loopback0
 mpls traffic-eng area 0
!
ip explicit-path name 1-2-3-7 enable
 index 1 next-label 16002
 index 2 next-label 16003
 index 3 next-label 16007
!
ip explicit-path name 1-5-6-7 enable
 index 1 next-label 16005
 index 2 next-label 16006
 index 3 next-label 16007
!
ip explicit-path name 1-2-3-5-6-7 enable
 index 1 next-label 16002
 index 2 next-label 16003
 index 3 next-label 16005
 index 4 next-label 16006
 index 5 next-label 16007
!
ip explicit-path name 1-2-3-5-2-6-7 enable
 index 1 next-label 16002
 index 2 next-label 16003
 index 3 next-label 16005
 index 4 next-label 16002
 index 5 next-label 16006
 index 6 next-label 16007
!#下一跳经过的标签设备,实际上控制流量的路径

R2:

version 16.6
service timestamps debug datetime localtime
service timestamps log datetime localtime
!
hostname R2
!
!
enable secret 5 $1$u41o$kce3mcpuxRE8ReCghFulx0
!
aaa new-model
!
no ip domain lookup
!
mpls traffic-eng tunnels
!
segment-routing mpls
 !
 connected-prefix-sid-map
  address-family ipv4
   2.2.2.2/32 index 2 range 1 
  exit-address-family
 !
!
username cisco privilege 15 secret 5 $1$hIlL$F6cSHbfm4Ww.n1tIFHarL1
!
interface Loopback0
 ip address 2.2.2.2 255.255.255.255
 ip ospf network point-to-point
 ip ospf 1 area 0
!
interface GigabitEthernet1
 ip address 192.168.12.2 255.255.255.0
 ip ospf network point-to-point
 ip ospf 1 area 0
 mpls traffic-eng tunnels
!
interface GigabitEthernet2
 ip address 192.168.23.2 255.255.255.0
 ip ospf network point-to-point
 ip ospf 1 area 0
 mpls traffic-eng tunnels
!
interface GigabitEthernet3
 ip address 192.168.25.2 255.255.255.0
 ip ospf network point-to-point
 ip ospf 1 area 0
 mpls traffic-eng tunnels
!
interface GigabitEthernet4
 ip address 192.168.26.2 255.255.255.0
 ip ospf network point-to-point
 ip ospf 1 area 0
 mpls traffic-eng tunnels
!
router ospf 1
 router-id 2.2.2.2
 segment-routing area 0 mpls
 segment-routing mpls
 mpls traffic-eng router-id Loopback0
 mpls traffic-eng area 0
!

R3:

version 16.6
service timestamps debug datetime localtime
service timestamps log datetime localtime
!
hostname R3
!
enable secret 5 $1$b1os$BJXuUtqgSB618QuaXRRMi/
!
aaa new-model
!
no ip domain lookup
!
mpls traffic-eng tunnels
!
!
segment-routing mpls
 !
 connected-prefix-sid-map
  address-family ipv4
   3.3.3.3/32 index 3 range 1 
  exit-address-family
 !
username cisco privilege 15 secret 5 $1$MD6m$0XtlNNa5lqaMED7e.w6tL.
!
!
interface Loopback0
 ip address 3.3.3.3 255.255.255.255
 ip ospf network point-to-point
 ip ospf 1 area 0
!
interface GigabitEthernet1
 ip address 192.168.37.3 255.255.255.0
 ip ospf network point-to-point
 ip ospf 1 area 0
 mpls traffic-eng tunnels
!
interface GigabitEthernet2
 ip address 192.168.23.3 255.255.255.0
 ip ospf network point-to-point
 ip ospf 1 area 0
 mpls traffic-eng tunnels
!
interface GigabitEthernet3
 ip address 192.168.36.3 255.255.255.0
 ip ospf network point-to-point
 ip ospf 1 area 0
 mpls traffic-eng tunnels
!
interface GigabitEthernet4
 ip address 192.168.35.3 255.255.255.0
 ip ospf network point-to-point
 ip ospf 1 area 0
 mpls traffic-eng tunnels
!
router ospf 1
 segment-routing area 0 mpls
 segment-routing mpls
 mpls traffic-eng router-id Loopback0
 mpls traffic-eng area 0
!

R5:

version 16.6
service timestamps debug datetime localtime
service timestamps log datetime localtime
!
hostname R5
!
enable secret 5 $1$oFyQ$Ut2gzGdZLHGqKLvECqeTP0
!
aaa new-model
!
!
no ip domain lookup
!
mpls traffic-eng tunnels
!
segment-routing mpls
 !
 connected-prefix-sid-map
  address-family ipv4
   5.5.5.5/32 index 5 range 1 
  exit-address-family
 !
username cisco privilege 15 secret 5 $1$niXI$PCbPObKVCf/PdsOcYosq..
!
interface Loopback0
 ip address 5.5.5.5 255.255.255.255
 ip ospf network point-to-point
 ip ospf 1 area 0
!
interface GigabitEthernet1
 ip address 192.168.15.5 255.255.255.0
 ip ospf network point-to-point
 ip ospf 1 area 0
 mpls traffic-eng tunnels
!
interface GigabitEthernet2
 ip address 192.168.56.5 255.255.255.0
 ip ospf network point-to-point
 ip ospf 1 area 0
 mpls traffic-eng tunnels
!
interface GigabitEthernet3
 ip address 192.168.25.5 255.255.255.0
 ip ospf network point-to-point
 ip ospf 1 area 0
 mpls traffic-eng tunnels
!
interface GigabitEthernet4
 ip address 192.168.35.5 255.255.255.0
 ip ospf network point-to-point
 ip ospf 1 area 0
 mpls traffic-eng tunnels
!
router ospf 1
 router-id 5.5.5.5
 segment-routing area 0 mpls
 segment-routing mpls
 mpls traffic-eng router-id Loopback0
 mpls traffic-eng area 0
!

R6:

version 16.6
service timestamps debug datetime localtime
service timestamps log datetime localtime
!
hostname R6
!
enable secret 5 $1$Po5z$6s71Kv37hrd15UHpSDS3v0
!
aaa new-model
!
no ip domain lookup
!
!
mpls traffic-eng tunnels
!
!
segment-routing mpls
 !
 connected-prefix-sid-map
  address-family ipv4
   6.6.6.6/32 index 6 range 1 
  exit-address-family
 !
username cisco privilege 15 secret 5 $1$xdXH$tg7sf/WsTLO9Q8l.26weM.
!
interface Loopback0
 ip address 6.6.6.6 255.255.255.255
 ip ospf network point-to-point
 ip ospf 1 area 0
!
interface GigabitEthernet1
 ip address 192.168.67.6 255.255.255.0
 ip ospf network point-to-point
 ip ospf 1 area 0
 mpls traffic-eng tunnels
!
interface GigabitEthernet2
 ip address 192.168.56.6 255.255.255.0
 ip ospf network point-to-point
 ip ospf 1 area 0
 mpls traffic-eng tunnels
!
interface GigabitEthernet3
 ip address 192.168.36.6 255.255.255.0
 ip ospf network point-to-point
 ip ospf 1 area 0
 mpls traffic-eng tunnels
!
interface GigabitEthernet4
 ip address 192.168.26.6 255.255.255.0
 ip ospf network point-to-point
 ip ospf 1 area 0
 mpls traffic-eng tunnels
!
router ospf 1
 router-id 6.6.6.6
 segment-routing area 0 mpls
 segment-routing mpls
 mpls traffic-eng router-id Loopback0
 mpls traffic-eng area 0
!

R7:

version 16.6
service timestamps debug datetime localtime
service timestamps log datetime localtime
!
hostname R7
!
enable secret 5 $1$wF9L$is9ZSr7ekX/OMFQ2ZElaj1
!
aaa new-model
!
!
no ip domain lookup
!
mpls traffic-eng tunnels
!
segment-routing mpls
 !
 connected-prefix-sid-map
  address-family ipv4
   7.7.7.7/32 index 7 range 1 
  exit-address-family
 !
!
username cisco privilege 15 secret 5 $1$SHrU$gaLUTcd5xo6T2GS0jCZRs/
!
interface Loopback0
 ip address 7.7.7.7 255.255.255.255
 ip ospf network point-to-point
 ip ospf 1 area 0
!
interface GigabitEthernet1
 ip address 192.168.37.7 255.255.255.0
 ip ospf network point-to-point
 ip ospf 1 area 0
 mpls traffic-eng tunnels
!
interface GigabitEthernet2
 ip address 192.168.67.7 255.255.255.0
 ip ospf network point-to-point
 ip ospf 1 area 0
 mpls traffic-eng tunnels
!
router ospf 1
 router-id 7.7.7.7
 segment-routing area 0 mpls
 segment-routing mpls
 mpls traffic-eng router-id Loopback0
 mpls traffic-eng area 0
!

查看状态

R1:

R1#show version 
Cisco IOS XE Software, Version 16.06.05
Cisco IOS Software [Everest], Virtual XE Software (X86_64_LINUX_IOSD-UNIVERSALK9-M), Version 16.6.5, RELEASE SOFTWARE (fc3)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2018 by Cisco Systems, Inc.
Compiled Mon 10-Dec-18 13:07 by mcpre


Cisco IOS-XE software, Copyright (c) 2005-2018 by cisco Systems, Inc.
All rights reserved.  Certain components of Cisco IOS-XE software are
licensed under the GNU General Public License ("GPL") Version 2.0.  The
software code licensed under GPL Version 2.0 is free software that comes
with ABSOLUTELY NO WARRANTY.  You can redistribute and/or modify such
GPL code under the terms of GPL Version 2.0.  For more details, see the
documentation or "License Notice" file accompanying the IOS-XE software,
or the applicable URL provided on the flyer accompanying the IOS-XE
software.


ROM: IOS-XE ROMMON

R1 uptime is 2 hours, 39 minutes
Uptime for this control processor is 2 hours, 42 minutes
System returned to ROM by reload
System image file is "bootflash:packages.conf"
Last reload reason: reload



This product contains cryptographic features and is subject to United
States and local country laws governing import, export, transfer and
use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
to comply with U.S. and local laws, return this product immediately.

A summary of U.S. laws governing Cisco cryptographic products may be found at:
http://www.cisco.com/wwl/export/crypto/tool/stqrg.html

If you require further assistance please contact us by sending email to
export@cisco.com.

License Level: ax
License Type: Default. No valid license found.
Next reload license Level: ax

cisco CSR1000V (VXE) processor (revision VXE) with 2190079K/3075K bytes of memory.
Processor board ID 9O8KIKS1UXW
4 Gigabit Ethernet interfaces
32768K bytes of non-volatile configuration memory.
3984864K bytes of physical memory.
7774207K bytes of virtual hard disk at bootflash:.
0K bytes of WebUI ODM Files at webui:.

Configuration register is 0x2102

R1#show ip route ospf
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area 
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override, p - overrides from PfR

Gateway of last resort is not set

      2.0.0.0/32 is subnetted, 1 subnets
O        2.2.2.2 [110/2] via 192.168.12.2, 02:25:05, GigabitEthernet1
      3.0.0.0/32 is subnetted, 1 subnets
O        3.3.3.3 [110/3] via 192.168.15.5, 02:25:00, GigabitEthernet2
                 [110/3] via 192.168.12.2, 02:25:05, GigabitEthernet1
      5.0.0.0/32 is subnetted, 1 subnets
O        5.5.5.5 [110/2] via 192.168.15.5, 02:25:05, GigabitEthernet2
      6.0.0.0/32 is subnetted, 1 subnets
O        6.6.6.6 [110/3] via 192.168.15.5, 02:25:05, GigabitEthernet2
                 [110/3] via 192.168.12.2, 02:25:05, GigabitEthernet1
      7.0.0.0/32 is subnetted, 1 subnets
O        7.7.7.7 [110/4] via 7.7.7.7, 02:25:05, Tunnel17
O     192.168.23.0/24 [110/2] via 192.168.12.2, 02:25:05, GigabitEthernet1
O     192.168.25.0/24 [110/2] via 192.168.15.5, 02:25:05, GigabitEthernet2
                      [110/2] via 192.168.12.2, 02:25:05, GigabitEthernet1
O     192.168.26.0/24 [110/2] via 192.168.12.2, 02:25:05, GigabitEthernet1
O     192.168.35.0/24 [110/2] via 192.168.15.5, 02:25:05, GigabitEthernet2
O     192.168.36.0/24 [110/3] via 192.168.15.5, 02:25:00, GigabitEthernet2
                      [110/3] via 192.168.12.2, 02:25:05, GigabitEthernet1
O     192.168.37.0/24 [110/3] via 192.168.15.5, 02:25:00, GigabitEthernet2
                      [110/3] via 192.168.12.2, 02:25:05, GigabitEthernet1
O     192.168.56.0/24 [110/2] via 192.168.15.5, 02:25:05, GigabitEthernet2
O     192.168.67.0/24 [110/3] via 192.168.15.5, 02:25:05, GigabitEthernet2
                      [110/3] via 192.168.12.2, 02:25:05, GigabitEthernet1

R1# 
R1#show ip ospf segment-routing sid-database 

            OSPF Router with ID (1.1.1.1) (Process ID 1)

OSPF Segment Routing SIDs

Codes: L - local, N - label not programmed,
       M - mapping-server

SID             Prefix              Adv-Rtr-Id       Area-Id          Type      
--------------  ------------------  ---------------  ---------------  ----------
1       (L)     1.1.1.1/32          1.1.1.1          0                Intra
2               2.2.2.2/32          2.2.2.2          0                Intra
3               3.3.3.3/32          3.3.3.3          0                Intra
5               5.5.5.5/32          5.5.5.5          0                Intra
6               6.6.6.6/32          6.6.6.6          0                Intra
7               7.7.7.7/32          7.7.7.7          0                Intra

R1#
R1#show mpls forwarding-table table 0
Local      Outgoing   Prefix           Bytes Label   Outgoing   Next Hop    
Label      Label      or Tunnel Id     Switched      interface              
16    [T]  Pop Label  17/1[TE-Bind]    0             Tu17       point2point 
17         Pop Label  192.168.15.5-A   0             Gi2        192.168.15.5
18         Pop Label  192.168.12.2-A   0             Gi1        192.168.12.2
16002      Pop Label  2.2.2.2/32       0             Gi1        192.168.12.2
16003      16003      3.3.3.3/32       0             Gi1        192.168.12.2
           16003      3.3.3.3/32       0             Gi2        192.168.15.5
16005      Pop Label  5.5.5.5/32       0             Gi2        192.168.15.5
16006      16006      6.6.6.6/32       0             Gi1        192.168.12.2
           16006      6.6.6.6/32       0             Gi2        192.168.15.5
16007      16007      0-7.7.7.7/32-0   0             Gi1        192.168.12.2
           16007      0-7.7.7.7/32-0   0             Gi2        192.168.15.5

[T]     Forwarding through a LSP tunnel.
        View additional labelling info with the 'detail' option

A  - Adjacency SID

R1#show ip inte brief 
Interface              IP-Address      OK? Method Status                Protocol
GigabitEthernet1       192.168.12.1    YES NVRAM  up                    up      
GigabitEthernet2       192.168.15.1    YES NVRAM  up                    up      
GigabitEthernet3       unassigned      YES NVRAM  administratively down down    
GigabitEthernet4       unassigned      YES NVRAM  administratively down down    
Loopback0              1.1.1.1         YES NVRAM  up                    up      
Tunnel17               1.1.1.1         YES TFTP   up                    up      

R1#show mpls traffic-eng tunnels segment-routing 

P2P TUNNELS/LSPs:

Name: R1_t17                              (Tunnel17) Destination: 7.7.7.7
  Status:
    Admin: up         Oper: up     Path: valid       Signalling: connected
    path option 1, (SEGMENT-ROUTING) type explicit 1-2-3-7 (Basis for Setup)
    path option 2, (SEGMENT-ROUTING) type explicit 1-5-6-7
    path option 3, (SEGMENT-ROUTING) type explicit 1-2-3-5-6-7
    path option 4, (SEGMENT-ROUTING) type explicit 1-2-3-5-2-6-7

  Config Parameters:
    Bandwidth: 0        kbps (Global)  Priority: 7  7   Affinity: 0x0/0xFFFF
    Metric Type: IGP (interface)
    Path Selection:
     Protection: any (default)
    Path-selection Tiebreaker:
      Global: not set   Tunnel Specific: not set   Effective: min-fill (default)
    Hop Limit: disabled [ignore: Explicit Path Option with all Strict Hops]
    Cost Limit: disabled
    Path-invalidation timeout: 10000 msec (default), Action: Tear
    AutoRoute: enabled  LockDown: disabled Loadshare: 10 [200000000]
    auto-bw: disabled
    Fault-OAM: disabled, Wrap-Protection: disabled, Wrap-Capable: No
  Active Path Option Parameters:
    State: explicit path option 1 is active
    BandwidthOverride: disabled  LockDown: disabled  Verbatim: disabled

  History:
    Tunnel:
      Time since created: 2 hours, 28 minutes
      Time since path change: 2 hours, 26 minutes
      Number of LSP IDs (Tun_Instances) used: 81
    Current LSP: [ID: 81]
      Uptime: 2 hours, 26 minutes
  Tun_Instance: 81
  Segment-Routing Path Info (ospf 1  area 0)
    Segment0[Node]: 2.2.2.2, Label: 16002
    Segment1[ - ]: Label: 16003
    Segment2[ - ]: Label: 16007
P2MP TUNNELS:

P2MP SUB-LSPS:

路径测试

R1#traceroute 7.7.7.7 source lo0
Type escape sequence to abort.
Tracing the route to 7.7.7.7
VRF info: (vrf in name/id, vrf out name/id)
  1 192.168.12.2 [MPLS: Labels 16003/16007 Exp 0] 641 msec 606 msec 434 msec
  2 192.168.23.3 [MPLS: Label 16007 Exp 0] 543 msec 206 msec 2 msec
  3 192.168.37.7 1040 msec 670 msec 1038 msec

测试结果如上所示流量是R1-R2-R3-R7。

更换流量路径:

R1#mpls traffic-eng reoptimize tunnel 17 path-option 3
The targeted path-option is not in lock down mode. Continue? [no]: yes
R1#
R1#traceroute 7.7.7.7 source lo0
Type escape sequence to abort.
Tracing the route to 7.7.7.7
VRF info: (vrf in name/id, vrf out name/id)
  1 192.168.12.2 [MPLS: Labels 16003/16005/16006/16007 Exp 0] 1654 msec 1009 msec 1078 msec
  2 192.168.23.3 [MPLS: Labels 16005/16006/16007 Exp 0] 63 msec 1021 msec 1296 msec
  3 192.168.35.5 [MPLS: Labels 16006/16007 Exp 0] 613 msec 1016 msec 1013 msec
  4 192.168.56.6 [MPLS: Label 16007 Exp 0] 120 msec 2 msec 3 msec
  5 192.168.67.7 9 msec *  297 msec

现在的流量路径为R1-R2-R3-R5-R6-R7

R1#show mpls traffic-eng tunnels segment-routing 

P2P TUNNELS/LSPs:

Name: R1_t17                              (Tunnel17) Destination: 7.7.7.7
  Status:
    Admin: up         Oper: up     Path: valid       Signalling: connected
    path option 3, (SEGMENT-ROUTING) type explicit 1-2-3-5-6-7 (Basis for Setup)
    path option 1, (SEGMENT-ROUTING) type explicit 1-2-3-7
    path option 2, (SEGMENT-ROUTING) type explicit 1-5-6-7
    path option 4, (SEGMENT-ROUTING) type explicit 1-2-3-5-2-6-7

  Config Parameters:
    Bandwidth: 0        kbps (Global)  Priority: 7  7   Affinity: 0x0/0xFFFF
    Metric Type: IGP (interface)
    Path Selection:
     Protection: any (default)
    Path-selection Tiebreaker:
      Global: not set   Tunnel Specific: not set   Effective: min-fill (default)
    Hop Limit: disabled [ignore: Explicit Path Option with all Strict Hops]
    Cost Limit: disabled
    Path-invalidation timeout: 10000 msec (default), Action: Tear
    AutoRoute: enabled  LockDown: disabled Loadshare: 10 [200000000]
    auto-bw: disabled
    Fault-OAM: disabled, Wrap-Protection: disabled, Wrap-Capable: No
  Active Path Option Parameters:
    State: explicit path option 3 is active
    BandwidthOverride: disabled  LockDown: disabled  Verbatim: disabled

  History:
    Tunnel:
      Time since created: 2 hours, 32 minutes
      Time since path change: 29 seconds
      Number of LSP IDs (Tun_Instances) used: 82
    Current LSP: [ID: 82]
      Uptime: 32 seconds
      Selection: reoptimization
    Prior LSP: [ID: 81]
      ID: path option unknown
      Removal Trigger: reoptimization completed
  Tun_Instance: 82
  Segment-Routing Path Info (ospf 1  area 0)
    Segment0[Node]: 2.2.2.2, Label: 16002
    Segment1[Node]: 3.3.3.3, Label: 16003
    Segment2[Node]: 5.5.5.5, Label: 16005
    Segment3[Node]: 6.6.6.6, Label: 16006
    Segment4[Node]: 7.7.7.7, Label: 16007

P2MP TUNNELS:

P2MP SUB-LSPS:
R1#

再次切换路径测试:

R1#mpls traffic-eng reoptimize tunnel 17 path-option 4
The targeted path-option is not in lock down mode. Continue? [no]: yes
R1#
R1#
R1#traceroute 7.7.7.7 source lo0                      
Type escape sequence to abort.
Tracing the route to 7.7.7.7
VRF info: (vrf in name/id, vrf out name/id)
  1 192.168.12.2 [MPLS: Labels 16003/16005/16002/16006/16007 Exp 0] 700 msec 111 msec 984 msec
  2 192.168.23.3 [MPLS: Labels 16005/16002/16006/16007 Exp 0] 97 msec 1000 msec 1098 msec
  3 192.168.35.5 [MPLS: Labels 16002/16006/16007 Exp 0] 652 msec 439 msec 652 msec
  4 192.168.25.2 [MPLS: Labels 16006/16007 Exp 0] 445 msec 91 msec 2 msec
  5 192.168.26.6 [MPLS: Label 16007 Exp 0] 2 msec 2 msec 2 msec
  6 192.168.67.7 4 msec *  4 msec

现在的流量路径为R1-R2-R3-R5-R2-R6-R7
查看状态也确实如此:

R1#show mpls traffic-eng tunnels segment-routing      

P2P TUNNELS/LSPs:

Name: R1_t17                              (Tunnel17) Destination: 7.7.7.7
  Status:
    Admin: up         Oper: up     Path: valid       Signalling: connected
    path option 4, (SEGMENT-ROUTING) type explicit 1-2-3-5-2-6-7 (Basis for Setup)
    path option 1, (SEGMENT-ROUTING) type explicit 1-2-3-7
    path option 2, (SEGMENT-ROUTING) type explicit 1-5-6-7
    path option 3, (SEGMENT-ROUTING) type explicit 1-2-3-5-6-7

  Config Parameters:
    Bandwidth: 0        kbps (Global)  Priority: 7  7   Affinity: 0x0/0xFFFF
    Metric Type: IGP (interface)
    Path Selection:
     Protection: any (default)
    Path-selection Tiebreaker:
      Global: not set   Tunnel Specific: not set   Effective: min-fill (default)
    Hop Limit: disabled [ignore: Explicit Path Option with all Strict Hops]
    Cost Limit: disabled
    Path-invalidation timeout: 10000 msec (default), Action: Tear
    AutoRoute: enabled  LockDown: disabled Loadshare: 10 [200000000]
    auto-bw: disabled
    Fault-OAM: disabled, Wrap-Protection: disabled, Wrap-Capable: No
  Active Path Option Parameters:
    State: explicit path option 4 is active
    BandwidthOverride: disabled  LockDown: disabled  Verbatim: disabled

  History:
    Tunnel:
      Time since created: 2 hours, 34 minutes
      Time since path change: 17 seconds
      Number of LSP IDs (Tun_Instances) used: 83
    Current LSP: [ID: 83]
      Uptime: 20 seconds
      Selection: reoptimization
    Prior LSP: [ID: 82]
      ID: path option unknown
      Removal Trigger: reoptimization completed
  Tun_Instance: 83
  Segment-Routing Path Info (ospf 1  area 0)
    Segment0[Node]: 2.2.2.2, Label: 16002
    Segment1[Node]: 3.3.3.3, Label: 16003
    Segment2[Node]: 5.5.5.5, Label: 16005
    Segment3[Node]: 2.2.2.2, Label: 16002
    Segment4[Node]: 6.6.6.6, Label: 16006
    Segment5[Node]: 7.7.7.7, Label: 16007

P2MP TUNNELS:

P2MP SUB-LSPS:
R1#

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